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A New Cave Centipede from Croatia A peer-reviewed open-access journal ZooKeys 687: 11–43Eupolybothrus (2017) liburnicus sp. n. with notes on subgenus Schizopolybothrus 11 doi: 10.3897/zookeys.687.13884 RESEARCH ARTICLE http://zookeys.pensoft.net Launched to accelerate biodiversity research A new cave centipede from Croatia, Eupolybothrus liburnicus sp. n., with notes on the subgenus Schizopolybothrus Verhoeff, 1934 (Chilopoda, Lithobiomorpha, Lithobiidae) Nesrine Akkari1, Ana Komerički2, Alexander M. Weigand2,3, Gregory D. Edgecombe4, Pavel Stoev5 1 Naturhistorisches Museum Wien, Burgring 7, 1010 Wien, Austria 2 Croatian Biospeleological Society, Za- greb, Croatia 3 University of Duisburg-Essen, Essen, Germany 4 Department of Earth Sciences, The Natural History Museum, Cromwell Road, London SW7 5BD, UK 5 National Museum of Natural History and Pensoft Publishers, Sofia, Bulgaria Corresponding author: Nesrine Akkari ([email protected]) Academic editor: M. Zapparoli | Received 26 May 2017 | Accepted 1 July 2017 | Published 1 August 2017 http://zoobank.org/94C0F9A5-3758-4AFE-93AE-87ED5EDF744D Citation: Akkari N, Komerički A, Weigand AM, Edgecombe GD, Stoev P (2017) A new cave centipede from Croatia, Eupolybothrus liburnicus sp. n., with notes on the subgenus Schizopolybothrus Verhoeff, 1934 (Chilopoda, Lithobiomorpha, Lithobiidae). ZooKeys 687: 11–43. https://doi.org/10.3897/zookeys.687.13844 Abstract A new species of Eupolybothrus Verhoeff, 1907 discovered in caves of Velebit Mountain in Croatia is de- scribed. E. liburnicus sp. n. exhibits a few morphological differences from its most similar congeners, all of which are attributed to the subgenus Schizopolybothrus Verhoeff, 1934, and two approaches to species delimitation using the COI barcode region identify it as distinct from the closely allied E. cavernicolus Stoev & Komerički, 2013. E. spiniger (Latzel, 1888) is redescribed and a lectotype is designated for it as well as E. caesar (Verhoeff, 1899) to stabilize their respective taxonomic status. The subspeciesE. acherontis wardaranus Verhoeff, 1937, previously suspected to be a synonym of E. caesar (Verhoeff, 1899), is redescribed and its taxonomy revised after the study of type material whereas the identity of E. acherontis (Verhoeff, 1900) described from a female from southwest Trebinje (Bosnia and Herzegovina) remains unknown. Type material of E. stygis (Folkmanova, 1940) is confirmed to be lost and future designation of neotypes from topotypic specimens is necessary to stabilize its taxonomy. The importance of setal arrangement on the intermediate and 14th tergites and the sexual modifications on the male 15th prefemur for species identification is discussed in the light of present findings, and a review of the species of E. (Schizopolybothrus) that display these traits is also provided. Copyright Nesrine Akkari et al. This is an open access article distributed under the terms of the Creative Commons Attribution License (CC BY 4.0), which permits unrestricted use, distribution, and reproduction in any medium, provided the original author and source are credited. 12 Nesrine Akkari et al. / ZooKeys 687: 11–43 (2017) Keywords Biospeleology, COI barcoding, Eupolybothrus, new species, SEM, Velebit Mountain Introduction The genus Eupolybothrus Verhoeff, 1907 comprisesca . 40 valid and doubtful species and subspecies. All species are described from Eastern European and circum-Mediter- ranean countries, including the largest Mediterranean islands, Corsica, Crete, Cyprus, Sardinia and Sicily (Zapparoli 2002, Stoev et al. 2010, 2013). Seven subgenera were defined for the genus Eupolybothrus, based on a combination of morphological characters but these groupings remain questionable and perhaps do not reflect phylogenetic relationships (see Stoev et al. 2010, 2013). However, they tradi- tionally helped to facilitate species identification with conventional taxonomic methods. Verhoeff (1934) designated the subgenus Schizopolybothrus and assigned Lithobius caesar Verhoeff, 1899 as its type species. This subgenus was later re-defined by Jeekel (1967) and extended to include all species with posterior projections on tergites 9, 11 and 13, having spines 15VCa and 15VCm and a simple apical claw on the ultimate legs (Eason 1983). Jeekel (1967) also divided the subgenus into three species groups, based on male gonopods and modifications of the 15th leg but this subdivision was recently rejected by Stoev et al. (2013), who considered groups II and III as invalid due to an erroneous placement of several species. In group III, E. zeus (Verhoeff, 1901) and E. sissi (Kanel- lis, 1959) were for instance synonymized with E. (Mesobothrus) transsylvanicus (Latzel, 1882) by Zapparoli (2002) and E. excellens (Silvestri, 1894) was wrongly placed together with E. tabularum (Verhoeff, 1937) in group II, based only on female characters. Currently, the subgenus Schizopolybothrus comprises nine species and subspecies, viz. Eupolybothrus acherontis (Verhoeff, 1900),E. acherontis wardaranus (Verhoeff, 1937), E. caesar (Verhoeff, 1899), E. cavernicolus Komerički & Stoev, 2013, E. excellens (Silvestri, 1894), E. leostygis (Verhoeff, 1899),E. spiniger (Latzel, 1888), E. stygis (Folkmanova, 1940), and E. tabularum (Verhoeff, 1937). Some of these are still poorly known and of uncertain taxonomic status. For example, E. spiniger, E. stygis, E. acherontis and E. acherontis wardaranus were known only from their original descriptions (see also Stoev 2001a, b, Stoev et al. 2010). While E. leostygis was recently re-described (Eason 1983, Stoev et al. 2013), all attempts to find new material ofE. stygis have failed and the types are now confirmed to be destroyed (Tuf, personal communication). Here, we 1) describe a new species, sp. n., recently collected in caves of Velebit Mountain in Croatia; 2) compare all species of Schizopolybothrus focusing on morphological characters that involve modifications of the male prefemur 15 and the intermediate tergite, and supplementing these with the cytochrome c oxidase subunit I (COI) gene for species delimitation; 3) examine and re-describe the type material of E. spiniger and E. acherontis wardaranus housed in Naturhistorisches Museum Wien and the Zoologische Staatssammlung München (ZSM) respectively; 4) designate a lectotype for both E. spiniger and E. caesar. E. acherontis, Eupolybothrus liburnicus sp. n. with notes on subgenus Schizopolybothrus 13 described by Verhoeff (1900) from a single female specimen and housed in the Senckenberg Naturmuseum Frankfurt am Main, was not accessible to study. An integrative approach with a combination of morphological and molecular methods is certainly required to better understand the evolutionary history of this group and delineate the number of valid taxa, towards which the present work is a step. The present work is part of an ongoing revision of the subfamily Ethopolyinae (Stoev et al. 2010, Porco et al. 2011, Komerički et al. 2012, Stoev et al. 2013). Materials and methods Morphology All specimens were collected by hand and preserved in 70% or 96% ethanol. The holo- type was photographed in situ using a Canon 400D camera with a 65 mm macro ob- jective. Microphotographs were obtained with a Nikon DS-F2.5 camera mounted on a Nikon SMZ25 stereomicroscope using NIS-Elements Microscope Imaging Software with an Extended Depth of Focus (EDF) patch. For scanning electron microscopy, parts of some specimens were cleaned with ultrasound, transferred to 96% ethanol then to acetone, air-dried, mounted on aluminum stubs, coated with Platinum/Pal- ladium and studied in a JEOL JSM-6335F scanning electron microscope. All images were edited in Adobe Photoshop CS6 and assembled in Adobe InDesign CS6. Type material is shared between the Croatian Biospeleological Society – Croatian Natural History Museum (CBSS), The Natural History Museum Denmark – University of Co- penhagen (ZMUC), Naturhistorisches Museum Wien (NHMW), and the National Museum of Natural History, Sofia (NMNHS). Morphological terminology follows Bonato et al. (2010). Molecular species delimitation The standard DNA barcoding locus, the Folmer-fragment of the cytochrome c oxi- dase subunit I (COI) gene was sequenced to delimit E. liburnicus sp. n. from other Eupolybothrus species. Mid-body legs of four specimens conserved in 70% and 96% ethanol were sent to the Canadian Centre for DNA Barcoding, Guelph, where stand- ard protocols for DNA isolation, PCR and sequencing were performed. The analysed specimens are stored in The Barcode of Life Data System (BOLD) (Ratnasingham and Hebert 2007) project ‘Eupolybothrus in Croatia’ (EUCR). Genetic data for the mo- lecular comparison of Eupolybothrus species were retrieved from Stoev et al. (2013). All COI-sequences were aligned using the MAFFT-plugin of Geneious 5.4.7 (Kearse et al. 2012) under the G-INS-i option proposed for less than 200 sequences with global homology. Primer sequences at the 5’ and 3’ ends of the alignment were manually trimmed. Molecular species delimitation was performed using two approaches. 14 Nesrine Akkari et al. / ZooKeys 687: 11–43 (2017) Firstly, we used the Automatic Barcode Gap Discovery (ABGD) method of Puillandre et al. (2012). ABGD semi-automatically screens for the presence of a barcoding gap sepa- rating within-species (intraspecific) and between-species (interspecific) genetic diversity. We tested several prior combinations of relative gap width (X; ranging from 0.05 – 1.5), minimal intraspecific distance (Pmin; starting at 0.001) and maximal intraspecific distance (Pmax; 0.02 –
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